addresses issue #4156
when there are large number of members of in a team, for me 260+

From:
[2013-06-01 00:55:01]   Rendered team_members/_team_member.html.haml (206.9ms)
[2013-06-01 00:55:01]   Rendered team_members/_team.html.haml (54479.2ms)

To:
[2013-06-02 02:40:36]   Rendered team_members/_team_member.html.haml (2.1ms)
[2013-06-02 02:40:36]   Rendered team_members/_team.html.haml (1412.6ms)
Merge pull request #4163 from jdamick/slow_team_list

addresses issue #4156